INSPECTION PROCEDURE 1: Central door locking system does not work at all.


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.








OPERATION



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the front door lock actuator (driver’s side)
  • Malfunction of power window main switch (centre door lock switch) <LH drive vehicles (Except RUSSIA)>
  • Malfunction of ETACS-ECU
  • Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code



Q. Is the diagnosis code set?





STEP 2. M.U.T.-III data list




  • Driver’s inside lock knob operation.
Item No.
 Item name
 Normal condition
270
 Dr door lock switch
 Not lock→ Lock
271
 Dr door unlock switch
 Not Unlock→ Unlock
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?





STEP 3. Connector check: C-309 ETACS-ECU connector


Q. Is the check result normal?





STEP 4. Check the wiring harness between C-309 ETACS-ECU connector terminal No. 2 and fusible link (37)<4A9, 4B1> or (42)<BWC>.



  • Check the power supply line for open circuit and short circuit.

Q. Is the check result normal?







STEP 5. Connector check: E-14 power window main switch connector


Q. Is the check result normal?





STEP 6. Power window main switch check



Q. Is the check result normal?





STEP 7. Connector check: C-301, C-315 ETACS-ECU connector


Q. Is the check result normal?





STEP 8. Check of the wiring harness between the C-301 ETACS-ECU connector terminal No. 2 and the E-14 power window main switch connector terminal No. 13, the C-315 ETACS-ECU connector terminal No. 15 and the E-14 power window main switch connector terminal No. 5


note Prior to the wiring harness inspection, check C-02 joint connector (3)<LHD>, C-39 joint connector (1)<LHD>, C-126 <LHD> intermediate connector, and repair if necessary.

  • Check the input/output line for open circuit.

Q. Is the check result normal?





STEP 9. Retest the system.



Q. Is the check result normal?